http://nopr.niscair.res.in/handle/123456789/14687 Search the Channel search http://nopr.niscair.res.in/simple-search http://nopr.niscair.res.in/handle/123456789/14702 Title: Use of bacterial lipase for scouring of cotton fabrics <br/> <br/>Authors: Raja, K Senthil; Vasanthi, N S; Saravanan, D; Ramachandran, T <br/> <br/>Abstract: Attempt has been made to analyse the efficiency of bacterial lipase as a scouring agent for raw cotton fabrics to remove the natural hydrophobic substances present in the fibre. Improvement in the drop absorbency is observed to significant extent in the lipase scoured fabric samples and the lowest absorbency time of the treated sample is observed at 2 s, though the extractable impurities are at higher levels (2.14%). FTIR results show reduction in the band intensities related to hydroxyl stretch, and symmetric and asymmetric stretching of alkyl groups attributable to the waxy substances present in the raw cotton fibres. <br/> <br/>Page(s): 299-302 Wed, 29 Aug 2012 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/14701 Title: Influence of plasma processing parameters on mechanical properties of wool fabrics <br/> <br/>Authors: Goud, Varun S <br/> <br/>Abstract: Wool fabric has been treated with low-temperature plasma using a di-electric barrier discharge plasma reactor under atmospheric pressure. Air was used as the non-polymerizing gas for plasma treatment. The effect of plasma process parameters, viz voltage (4.0, 4.5, 5.0 and 5.5 kV) and the inter-electrode spacing (2, 3 and 4 mm) on the properties of wool fabric has been studied. Breaking strength, breaking elongation and low-stress mechanical properties of the treated and untreated wool fabrics are evaluated. Surface topographical changes after plasma treatment of wool have been assessed by scanning electron microscopy. It is found that the tensile, bending, compression, shear, and surface properties depend on the applied voltage and the inter-electrode spacing. As the applied voltage across the electrodes is increased and the inter-electrode spacing is decreased, the etching effect of active species in plasma over the wool substrate is increased. This results in improved tensile properties at breaking load, increased bending and shear rigidity, and decreased extension at low loads. <br/> <br/>Page(s): 292-298 Wed, 29 Aug 2012 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/14700 Title: Surface modification of polyester fabric using polyvinyl alcohol in alkaline medium <br/> <br/>Authors: Natarajan, Swarna; Moses, J Jeyakodi <br/> <br/>Abstract: Chemisorption of polyvinyl alcohol (PVA) onto polyester fabric in alkaline medium has been conducted. The treated fabric is characterized by scanning electron microscope, ATR-FTIR spectroscopy, contact angle, differential scanning calorimetry and dyeability. The PVA treated polyester fabric shows improved hydrophilic character over intact and sodium hydroxide treated PET fabrics. <br/> <br/>Page(s): 287-291 Wed, 29 Aug 2012 22:58:59 GMT http://nopr.niscair.res.in/handle/123456789/14699 Title: Production of polypropylene melt blown nonwoven fabrics: Part I—Numerical simulation and prediction of fibre diameter <br/> <br/>Authors: Bo, Zhao <br/> <br/>Abstract: The air drawing model and the air jet flow field model of dual slot inset sharp die of melt blowing for polypropylene polymer nonwovens have been established. The dual slot inset sharp die is often used to yield polymer fibres in the melt blowing process. The air jet flow field model of melt blowing is solved by using the finite difference method. The numerical computation results of air speed distribution are found to be in accordance with the experimental values. The influence of melt blowing processing parameters on the fibre diameter is also discussed. The predicted fibre diameter agrees with the experimental data. A lower polymer throughput rate, higher initial polymer melt temperature, larger die-to-collector distance, higher air initial temperature, and higher air initial velocity can yield finer fibres. The results show great potential of this research for the computer assisted design of melt blowing technology. <br/> <br/>Page(s): 280-286 Wed, 29 Aug 2012 22:58:59 GMT